S. FUKUDA, S.ANAMI , C. KUBOTA, M. KAWAMURA, S. YAMAGUCHI, M. ONO, H. NAKANISHI (KEK), S. MIYAKE*, M. SAKAMOTO*, (Toshiba)
The construction of the 60-MeV linac has been started as the low-energy front of the KEK/JEARI Joint Project for high-intensity proton accelerator facility in KEK[1]. The linac comprises a volume-production type negative hydrogen ion source, 3-MeV RFQ linac, 50-MeV Drift-tube linac (DTL) and a separated DTL. The accelerating frequency is 324 MHz. Five UHF klystrons are used as an rf source and their ratings have a maximum power of 3MW, a pulse width of 700 microsec (flat top is 650 microsec)and repetition rate of 50 pps[2]. We have manufactured a prototype klystron and tested. In this paper, the specification and developments of the rf source including WR-2300 WG system are summarized. We have tested up to the output power of 2.5 MW but during the test process the strong oscillations due to the back-going electrons from the collector were observed. These phenomena were analyzed experimentally and theoretically to solve them. This is also described in this paper and related papers[3].
[1] Y. Yamazaki and the JAERI/KEK Joint Accelerator Team, 'The Construction of the Low-Energy Front 60-MeV Linac for the JAERI/KEK Joint Project', in this conference.
[2] JHF Project Office, 'JHF Accelerator Design Study Report', KEK Report 97-16 (1999).
[3] Z. Fang, S. Fukuda, S. Yamaguchi and S. Anami, 'Simulation of back-going electron from a collector of klystron', in this conference.
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